Can a California company deduct PTO hours for not working 8 hours in a day even if you work 40 in a week?

[calvert]

My company deducts vacation time from employees for not working a full 8 hours in a day; regardless of how many hours you work in a week or pay period. Does this violate any labor laws in the state of California?
I find it suspect that they can take 0.5 vacation hours for my working 7.5 hours one day even if I work 10 the next and 50 in the week.

[ruelle]

There is no law in CA that says you get a vacation so there is no law that prevents them administering it as they want, the only law in CA is that any time you have must be paid.